My daughter happens to be slim and the robe barely fits her, even though I ordered a size bigger than she is now. I don't know how long it will fit her, but it *just* closes enough to keep her warm. I would suggest searching for a different robe if your child happens to be anything other than slim. I will not be purchasing a robe from this company again. A robe should be roomy, and you should be able to sit in it without it flying open due to lack of extra material.